.all span {
  font-size:100px;
  text-align: center;
  background-image:linear-gradient(90deg, #0066ff, #00eaff, #01b5ff, #00eaff, #0066ff);
  background-size:200%;
  background-clip:text;
  color:transparent;
}
.all span:hover {
  animation:txtMove linear 2s infinite;
}
@keyframes txtMove {
  0% {
    background-position:0%;
  }
  100% {
    background-position:200%;
  }
}